【GMAT考满分数学PS题库】The formula of height, in meters, of a substance i_真题_答案_解析 GMAT考满分官网

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The formula of height, in meters, of a substance is h=180+120t-60t^2, and t is time, in seconds. What is the average speed of this substance from t=1 to t=3?

A60
B80
C100
D120
E140

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正确答案: D

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